Drag and Drop Functionality

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CalculationActivity">


    <TextView
        android:id="@+id/question"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2 + 6 = ?"
        android:textSize="24sp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"/>

    <LinearLayout
        android:id="@+id/answer_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/question"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal"
        android:paddingTop="20dp">

        <TextView
            android:id="@+id/answer_box"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:background="@drawable/board_bg"
            android:gravity="center"
            android:textSize="24sp"/>

    </LinearLayout>

    <LinearLayout
        android:id="@+id/options"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/answer_container"
        android:layout_marginTop="40dp"
        android:gravity="center"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/option1"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:background="@drawable/board_bg"
            android:gravity="center"
            android:text="8"
            android:textSize="24sp"
            android:layout_margin="10dp"
            android:tag="8"
            android:clickable="true"
            android:focusable="true"/>

        <TextView
            android:id="@+id/option2"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:background="@drawable/board_bg"
            android:gravity="center"
            android:text="3"
            android:textSize="24sp"
            android:layout_margin="10dp"
            android:tag="3"
            android:clickable="true"
            android:focusable="true"/>

        <TextView
            android:id="@+id/option3"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:background="@drawable/board_bg"
            android:gravity="center"
            android:text="4"
            android:textSize="24sp"
            android:layout_margin="10dp"
            android:tag="4"
            android:clickable="true"
            android:focusable="true"/>

        <TextView
            android:id="@+id/option4"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:background="@drawable/board_bg"
            android:gravity="center"
            android:text="9"
            android:textSize="24sp"
            android:layout_margin="10dp"
            android:tag="9"
            android:clickable="true"
            android:focusable="true"/>
    </LinearLayout>

</RelativeLayout> 

package com.apdim3.learningforkidsunlimited;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.view.DragEvent;
import android.view.View;
import android.view.View.OnDragListener;
import android.view.View.OnLongClickListener;
import android.widget.TextView;
import android.widget.Toast;


public class CalculationActivity extends AppCompatActivity {
    private TextView answerBox;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calculation);



        answerBox = findViewById(R.id.answer_box);

        findViewById(R.id.option1).setOnLongClickListener(new MyClickListener());
        findViewById(R.id.option2).setOnLongClickListener(new MyClickListener());
        findViewById(R.id.option3).setOnLongClickListener(new MyClickListener());
        findViewById(R.id.option4).setOnLongClickListener(new MyClickListener());

        answerBox.setOnDragListener(new MyDragListener());
    }

    private final class MyClickListener implements OnLongClickListener {
        @Override
        public boolean onLongClick(View view) {
            View.DragShadowBuilder myShadow = new View.DragShadowBuilder(view);
            view.startDrag(null, myShadow, view, 0);
            return true;
        }
    }

    private class MyDragListener implements OnDragListener {
        @Override
        public boolean onDrag(View v, DragEvent event) {
            switch (event.getAction()) {
                case DragEvent.ACTION_DROP:
                    TextView dropped = (TextView) event.getLocalState();
                    answerBox.setText(dropped.getText().toString());

                    if (checkAnswer(dropped.getText().toString())) {
                        Toast.makeText(CalculationActivity.this, "Correct!", Toast.LENGTH_SHORT).show();
                        // Proceed to next question
                    } else {
                        Toast.makeText(CalculationActivity.this, "Wrong!", Toast.LENGTH_SHORT).show();
                        answerBox.setText("");
                    }
                    break;
                default:
                    break;
            }
            return true;
        }
    }

    private boolean checkAnswer(String answer) {
        // Check if the answer is correct
        return answer.equals("8");

    }
}